Point charges Q1=1kNl, Q2=1nCl, Q3=-1kNl, Q4=-1kNl are located on the plane at the lattice nodes with a cell in the form of a square with side a=0.1 m. The lattice nodes, in which the indicated charges are located, are given by radii -vectors r1=(0,0), r2=(a,0), r3=(a,a), r4=(0,a). There are no charges at the other nodes. Determine the dipole moment of this system of charges and its potential energy P in an external electric field E=0.1 V/m.

Point charges Q1=1kNl, Q2=1nCl, Q3=-1kNl, Q4=-1kNl are located on the plane at the lattice nodes with a cell in the form of a square with side a=0.1 m. The lattice nodes, in which the indicated charges are located, are given by radii -vectors r1=(0,0), r2=(a,0), r3=(a,a), r4=(0,a). There are no charges at the other nodes. Determine the dipole moment of this system of charges and its potential energy P in an external electric field E=0.1 V/m.